Hi Brent,

I have some IR Remote control code that I could share with you that would
probably do the job.

The code is written in PICC Lite ("C"), runs at 4 MHz with TMR0 overflowing
every 1,024 usecs.  The I/R receiver input is passed to RB0/INT and on every
rising edge, the TMR0 value is saved to determine the length of the High/Low
signal that just passed.

myke
----- Original Message -----
From: "Brent Brown" <brent.brown@CLEAR.NET.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, September 01, 2002 9:14 PM
Subject: [PIC]: RF remote control decoding


> Hi all,
>
> I'm interested in talking to anyone who has done decoding of data
> from an RF 2 button remote control. I'll skip most of the details and
> get down to the problem.
>
> The data is sent as a combination of short and long pulses. I receive
> the pulses OK, and have developed some code that discriminates
> between short and long pulses, (approx 500us & 1500us), and
> succesfully recognises each button press. It works well, but not well
> enough. There is zero tolerance for pulses that are "broken up"
> during less than perfect reception. This results in a relatively poor
> range of operation. My assumption is that there is still enough of
> the pulse getting through that it should still be possible to
> identify short and long data pulses.
>
> I'm using a PIC16F877 with the data from the receiver module coming
> into RB0/INT. Presently I interrupt on a rising edge, start a timer,
> switch to falling edge and on that interrupt read the timer value
> which is the pulse width.
>
> I have been thinking of all kinds of averaging and integrating
> schemes but my brain hurts and I haven't found a workable solution
> yet. I would appreciate any helpful suggestions, especially from
> anyone that has already been there and done that.
>
> Thanks, Brent.
>
> --
> Brent Brown, Electronic Design Solutions
> 16 English Street, Hamilton, New Zealand
> Ph/fax: +64 7 849 0069
> Mobile/txt: 025 334 069
> eMail:  brent.brown@clear.net.nz
>
> --
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>
>
>
>

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